Sawmill-dog



'No Model.) 2 Sheets-Sheet 1,

A. M. BBARD. -SAWMILL DBG.

No. 562,700. Patented June 23, 1896.

lNwlNToR f @a @WQ (No Model.) 2 Sheets-Sheet 2.

A. M. BEARD. SAWMILL DQG.

Patented June 23, 1896.

UNITED STATES PATENT OEEicE.

ASA M. BEARD, OF NEW BOSTON, NEWT HAMPSHIRE.

SAWMlLL-DOG.

SPECIFICATION forming part of Letters Patent No. 562,700, dated J une 23, 1896.

Application filed December 11, 1895. Serial No. 571,764. (No model.)

To all whom t may concern.-

Be it known that I, ASA M. BEARD, a citizen of the United States, residing at New Boston, in the county of Hillsborough and State of New Hampshire, have invented certain new and useful Improvements in Sawmill-Dogs; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in sawmill dogs or clamps; and the invention consists of the combination of a mill-carriage, a clamp mounted thereon and comprising a frame, slides mounted therein and provided with log-engaging dogs, and means for drawing said slides together, whereby the said dogs are pulled toward each other and clamp the log firmly between them.

It also consists of certain other novel constructions, combinations, and arrangements of parts, all of which will be hereinafter more particularly set forth and claimed.

In the accompanying drawings, forming part of this specication, Figure l represents a side elevation of the devices embodying my invention. Fig. 2 represents a front elevation of the same. Fig. 3 represents a side elevation of said devices, taken on the opposite sidet'rom that illustrated in Fig. 1. Fig. i represents a detail front elevation, partly broken away, of the upper portion of said devices; and Fig.y 5 represents a side elevation of the said devices shown in Fig. a.

A in the drawings represents the mill-carriage; B, the dog-frame movably mounted thereon; C, the adjusting-lever for said frame 5 D, the upper log-hook, and E the lower.

The carriage A is of any suitable construction and is provided with a suitable guidinggroove in which the frame B is adapted to slide, the bottom of said groove being provided with a rack a, which is adapted to be engaged by the pivoted lever C. This lever is pivoted on the frame B, and is provided with a segmental head c, having a rack-periphery c, which engages the rack a. The

said lever C is also provided with a pivoted spring-pressed pawl c2, which engages the teeth of a segmental rack h, formed on a portion of the frame B.

It will be seen from the aoregoing that the frame B can be moved forward or backward on the carriage and locked in such adjusted position.

The upright portion of the frame B is provided with a vertical groove h, in which the slides e e operate. The slide e' is provided at its upper end with a horizontal handle e2, a vertical stud e3, and a rack e4, the latter projecting through a slot in the bottom of the groove b. The slide e is mounted in front of the slide e' and is provided at its upper end with an apertured arm e5, which ts over the stud e3, and thus guides the upper end of said slide. The lower end of the slide is formed with the hook E, which projects outward in front of the frame B, so as to conveniently engage and irmly hold the log in front of said frame B. A block e is attached to the lower end of the slide e and takes under the overhanging edges b2 of the groove h'.

A vertical groove b3 is formed in one side of the vertical portion of the frame B to accommodate the slide d, which is adapted to move vertically therein, but 'be confined against lateral movement by the overhanging ilanges h4 of said groove. This slide d is provided with a rack-plate d' and a housing cl2 for the independently-movable dog or hook D. Said dog is loosely mounted in said housing and is provided with a head d3, a penetrating-point d4, and an offset or shoulder d5.

lVhen the dog is in its normal position, the head cl3 rests upon the housing d2, but when in use the oiset or shoulder di abuts against the under side of the said housing d2, and thus prevents any further upward movement oi the dog.

The slide d is provided with an operatinghandle d5, a binding-screw d?, and a springpressed friction earn-lever d3. The screw d? has a suitable operating-handle and passes through the rack-plate d' and the slide d and binds on the bottom of the groove h3, thereby locking said slide rigidly in position when so desired, as is sometimes the case, when the top of the log is to be held after the bottom hook or dog has been cast oii. The cam-lever d8 is for a similar purpose, but is automatic in its action. Said cam is pivoted. on the rackplate and passes through the same and the slide and engages the bottom of the groove Vhen the handle Z6 is gripped to push the slide either up or down, the cam-lever is also operated by the hand to free the same from the IOO ` mounted on a projection b of the frame B and is provided with a pawl f, pivoted in a recess f2 in said lever and adapted to be forced forward against a nose f3 in said recess by a springfi. Said pawl is adapted to engage the rack d when the dog D is to be operated. A pawl f is also pivoted on said lever F and is adapted to'engage the rack e4. This latter pawl is provided with an angular extension f6, having a laterally-projecting stud f7. The pawls j' and f are pivoted on opposite sides of the pivot-point of the lever F, so that any movement of said lever will raise the one and lower the other. A spring-pressed lever f8 is pivoted on the lever F and has a segmental nose j9, which is adapted to engage the stud f4 when said lever f8 is operated, and thus force the pawl f into engagement with the rack e4. Said pawl f is held normally out of engagement with said rack by its own weight.

A cam h is mounted on the lever F, so as to engage the periphery of the projection' h6. This cam is provided with an operatingdever 71', the outer end of which is connected to the lever F by a pivoted link b2.

NVhen the flat side of the log is placed against the frame B, the dog E is pulled upward until it engages said log, by the handle e2. The dog D is pulled downward by the handle d6] The lever F is now raised, which forces the pawls f and f into engagement with their respective racks. The continued upward movement of said lever F draws the rack e4 upward and the rack d downward, as before described, and the dogs are forced firmly into the log and hold it securely in position. As the lever F is raised the lever f8 is also operated, which forces the cam h against the periphery of the projection bs, and thus when the lever is released the said cam holds it securely in place, as any downward movement of said lever only tends to jam the cam more tightly against said projection.

When the pawls are to be released to loosen the log, the lever F is given a quick upward movement without touching the lever f8,which results in the cam being rotated so that it will not bind and prevent the descent of the lever F and the releasing of the two pawls f and f from their respective racks. The handle d is now raised quickly, which results in the housing cl2 engaging the head cl3 of the dog D and thus acts with a hammer stroke to disengage its point d4 from the log.

The cam h is so disposed in relation to the part b5 that it will not bind with sufficient force against said portion b upon the upward movement of the lever F to prevent said upward movement, but will immediately bind upon any downward movement of the lever by the rotation of the cam on its pivot.

Having now described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. The combination of a sawmill-carriage, a clamp mounted lthereon and comprising a frame, slides mounted side by side therein and provided with log-engaging` dogs and rackteeth reversely arranged, and a pivoted lever carrying pawls pivotally attached thereto and extending respectively up and down and adapted to engage said racks respectively, whereby the said dogs are pulled toward each other and clamp the log firmly between them, substantially as described.

2. The combination of a sawmill-carriage, a clamp mounted thereon and comprising a frame, slides mounted therein and provided with racks, dogs loosely mounted on said slides so as to be vertically movable independent of the same and a pivoted lever carrying pawls pivotally attached thereto and extending respectively up and down and adapted to engage said racks respectively, whereby said dogs are pulled toward each other and clamp the log firmly between them, substantially as described.

3. The combination of a sawmill-carriage, a clamp adj ustably mounted thereon and comprising a frame, slides mounted therein and provided with racks, dogs mounted on said slides, and a pivoted lever carrying pawls pivotally attached thereto and extending rc- Spectively up and down and adapted to engage said racks respectively, whereby the said dogs are pulled toward each other, a cam mounted on said pivoted lever and means for Operating said cam, whereby it is forced into engagement with a portion of said frame thus holding said lever stationary, substantially as described.

4. The combination of a sawmill-carriage, a clamp mounted thereon and comprising a frame, slides mounted therein, dogs mounted on said slides, means for drawing said slides together and holding them so, and means for locking one of said slides to said frame independent of the other, substantially as described.

5. The combination of a sawmill-carriage, a clamp mounted thereon and comprising a frame, slides mounted therein and provided with log-engaging dogs and racks, and a pivoted lever carrying pawls pivotally attached thereto and extending respectively up and down and adapted to engage said racks respectively, whereby the said dogs are pulled toward each other and a cam mounted on said lever and adapted to automatically lock the same in its adjusted positions, substantially as described.

In testimony whereof I hereunto aiiix my signature in presence of two witnesses.

ASA M. BEARD. Witnesses:

R. T. SMITH, l?. A. KENDALL.

IOO

IIO 

